Any way you look at it, 13.1 miles is quite a significant achievement. Runners will love this engraved 20 oz. stainless steel hot and cold running tumbler that's an ideal gift for half marathon runners and sure to be a favorite. The versatile, all-weather tumbler uses double-wall vacuum insulation to keep cold beverages cold and hot beverages cold, even when it is inside a bag or being used outside. A great way to bring along a drink while walking, moving or, yes, running. The durable tumbler is a great gift for a half marathon runner who commutes to and from work - and is great to use while there, as well as one who travels or enjoys day trips - or even for watching friends and family participate in a marathon. This is one running gift with no lack of uses, and one that is sure to be appreciated.